Niklas Laxström 417f8ff655 Use Language::isSupportedLanguage for language code validation ...

Aforementioned function is faster and available since 1.21 so we
can start using it. In addition it is needed to fix T104987.

Made it so that default value is empty string instead of null
because the language validations barf at null.

Bug: T104987
Change-Id: Ie944f5c8af0c825546f9fab660451f41ab7dde3c

2015-07-07 15:04:35 +02:00

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